20223147 has 16 divisors (see below), whose sum is σ = 31323392. Its totient is φ = 11365920.

The previous prime is 20223139. The next prime is 20223167. The reversal of 20223147 is 74132202.

It is not a de Polignac number, because 20223147 - 2³ = 20223139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20223167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6613 + ... + 9174.

It is an arithmetic number, because the mean of its divisors is an integer number (1957712).

Almost surely, 2^20223147 is an apocalyptic number.

20223147 is a deficient number, since it is larger than the sum of its proper divisors (11100245).

20223147 is a wasteful number, since it uses less digits than its factorization.

20223147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15858.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 20223147 is about 4497.0153435362. The cubic root of 20223147 is about 272.4475538042.

Adding to 20223147 its reverse (74132202), we get a palindrome (94355349).

The spelling of 20223147 in words is "twenty million, two hundred twenty-three thousand, one hundred forty-seven".